Effects of management intensity and soil chemical properties on <Emphasis Type="Italic">Rumex obtusifolius</Emphasis> in cut grasslands in Lower Austria |
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Authors: | Email author" target="_blank">Patrick?HannEmail author Claus?Trska Bernhard?Kromp |
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Institution: | (1) Bio Forschung Austria, Esslinger Hauptstrasse 132-134, 1220 Vienna, Austria |
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Abstract: | Rumex obtusifolius (broad-leaved dock) is a widely distributed weed in managed grasslands and is an indicator for excessive grassland management.
Especially in organic farming, its control is highly labour and energy intensive. The effects of management extensification
on R. obtusifolius were investigated by on-farm trials with reduced cutting frequencies and manuring amounts from 2004 to 2006 at three sites
in Lower Austria. The sites distinctly differed in their nutrient availabilities (LiCl-extract; Ca: ranged from 1,380 to 2,062 mg/kg
DM, Mg: 211–611 mg/kg, P: 4–40 mg/kg, K: 57–334 mg/kg). At one site reduced management intensity had a significant decreasing
effect on R. obtusifolius infestation, whereas at the other sites no effect was observed. Consequently, extensification as a measure for controlling
this weed can be effective under certain conditions. Soil analyses indicated that Ca and Mg concentrations were negatively
correlated to R. obtusifolius density, and the site where infestation declined under reduced management was characterised by abundant Ca and Mg in the
topsoil. K showed a weak positive correlation with plant density development and P was not related to R. obtusifolius. According to the literature, an abundance of Ca and Mg in the soil could reduce the competitiveness of the species. Consequently,
high concentrations of these nutrients might enhance the probability for an effective R. obtusifolius control by management extensification. Further research is required to clarify the influence of Ca and Mg on the competitiveness
of R. obtusifolius, and may lead to recommendations for the management of this weed. |
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